diff --git a/htdocs/externalsite/admin/index.php b/htdocs/externalsite/admin/index.php
index 1710a570c45..a9a41c5e555 100644
--- a/htdocs/externalsite/admin/index.php
+++ b/htdocs/externalsite/admin/index.php
@@ -58,7 +58,7 @@ if ($action == 'update') {
 
 	$exturl = GETPOST('EXTERNALSITE_URL', 'none');
 	$exturl = dol_string_onlythesehtmltags($exturl, 1, 1, 0, 1);
-	$exturl = dol_string_onlythesehtmlattributes($exturl);
+	$exturl = trim(dol_string_onlythesehtmlattributes($exturl));
 
 	$i += dolibarr_set_const($db, 'EXTERNALSITE_LABEL', trim($label), 'chaine', 0, '', $conf->entity);
 	$i += dolibarr_set_const($db, 'EXTERNALSITE_URL', trim($exturl), 'chaine', 0, '', $conf->entity);
@@ -108,7 +108,12 @@ print "</tr>";
 print '<tr class="oddeven">';
 print '<td class="fieldrequired">'.$langs->trans("ExternalSiteURL")."</td>";
 print '<td><textarea class="flat minwidth500" name="EXTERNALSITE_URL">';
-print (GETPOST('EXTERNALSITE_URL', 'restricthtml') ?GETPOST('EXTERNALSITE_URL', 'restricthtml') : (empty($conf->global->EXTERNALSITE_URL) ? '' : $conf->global->EXTERNALSITE_URL));
+
+$exturl = GETPOST('EXTERNALSITE_URL', 'none');
+$exturl = dol_string_onlythesehtmltags($exturl, 1, 1, 0, 1);
+$exturl = trim(dol_string_onlythesehtmlattributes($exturl));
+
+print (GETPOSTISSET('EXTERNALSITE_URL') ? $exturl : (empty($conf->global->EXTERNALSITE_URL) ? '' : $conf->global->EXTERNALSITE_URL));
 print '</textarea></td>';
 print "<td>http://localhost/myurl/";
 print "<br>https://wikipedia.org/";
diff --git a/htdocs/langs/en_US/externalsite.lang b/htdocs/langs/en_US/externalsite.lang
index da4853df0df..452100c65b3 100644
--- a/htdocs/langs/en_US/externalsite.lang
+++ b/htdocs/langs/en_US/externalsite.lang
@@ -1,5 +1,5 @@
 # Dolibarr language file - Source file is en_US - externalsite
 ExternalSiteSetup=Setup link to external website
-ExternalSiteURL=External Site URL
+ExternalSiteURL=External Site URL of HTML iframe content
 ExternalSiteModuleNotComplete=Module ExternalSite was not configured properly.
 ExampleMyMenuEntry=My menu entry